instance method cached_find_by

# File activerecord/lib/active_record/core.rb, line 418
        def cached_find_by(keys, values)
          statement = cached_find_by_statement(keys) { |params|
            wheres = keys.index_with do |key|
              if key.is_a?(Array)
                [key.map { params.bind }]
              else
                params.bind
              end
            end
            where(wheres).limit(1)
          }

          begin
            statement.execute(values.flatten, connection).first
          rescue TypeError
            raise ActiveRecord::StatementInvalid
          end
        end